Frequently Asked Questions
Can a surface be produced EMC compliant? And is an electrostatic discharge possible?
Generally both questions can be answered positively, even though it is always necessary to regard the complete system:
About EMC (Electromagnetic Compatibility):
This normally is achieved, because contact surfaces are "electrically conductive chromated". In this way, a permanent good shielding against electric fields is created, because the chromate conversion coating prevents a climate-induced tarnishing (corrosion) of the conductive layer. The attenuation can be further improved by using contact springs/EMC gaskets.
Regarding painted or powder-coated surfaces we distinguish, whether the back side is "unpainted" (spray mist/wrap-around permitted) or "free of lacquer" (no spray mist/wrap-around permitted). To enable to keep the contact surfaces cost-effectively free, we fall back on our own tool/device construction and the more than 40 years old experience with cover templates.
About ESD (Electrostatic Discharge):
In this case the shield consists normally of a varnish layer, which is equipped with high-ohm conductive pigments.
Make use of our experience!
The implementation of EMC and/or ESD measures is an option, which is performed on customer's request. In case of doubt we advise you to make us produce two prototypes with and without EMC/ESD measures, so that you are able to judge the suitability or the necessarity of the measures for series application at the CE acceptance test of the complete device. In addition to that, we can send you on request our customer information "KDI000010 CE marking of foil keyboards".